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Segment Information - Schedule of Operating Results by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | $ 243,759 | $ 238,086 | $ 227,632
Provision for (recovery of) loan losses | 8,557 | (5,101) | 4,990
Other income (loss) | 80,635 | 78,731 | 77,551
Gain (Loss) on Sale of Investments | 1,821 | 0 | 0
Other Noninterest Expense | 188,724 | 190,627 | 179,267
Depreciation, Amortization and Accretion, Net | 8,644 | 8,396 | 7,347
Other expense | 197,368 | 199,023 | 186,614
Income (loss) before taxes | 118,469 | 122,895 | 113,579
Income taxes (benefit) | 34,227 | 36,760 | 32,567
Net income | 84,242 | 86,135 | 81,012
Assets | 7,537,620 | 7,467,586 | 7,311,354
Loans | 5,372,483 | 5,271,857 | 5,068,085
Total deposits | 5,817,326 | 5,521,956 | 5,347,642
Totals For Reportable Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 243,171 | 238,224 | 227,393
Other Noninterest Expense | 179,919 | 180,896 | 169,295
Depreciation, Amortization and Accretion, Net | 8,644 | 8,396 | 7,347
Income taxes (benefit) | 36,922 | 41,117 | 37,238
Assets | 7,524,830 | 7,447,148 | 7,299,098
Total deposits | 5,900,125 | 5,634,008 | 5,451,920
PNB |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 235,243 | 227,576 | 220,879
Provision for (recovery of) loan losses | 9,898 | 2,611 | 7,665
Other income (loss) | 77,126 | 74,803 | 75,188
Other expense | 180,275 | 177,562 | 167,476
Income (loss) before taxes | 122,196 | 122,206 | 120,926
Income taxes (benefit) | 34,881 | 37,755 | 36,581
Net income | 87,315 | 84,451 | 84,345
Assets | 7,467,851 | 7,389,538 | 7,229,764
Loans | 5,339,255 | 5,234,828 | 5,029,072
Total deposits | 5,896,676 | 5,630,199 | 5,447,293
GFSC |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 5,839 | 5,874 | 6,588
Provision for (recovery of) loan losses | 1,917 | 1,887 | 1,415
Other income (loss) | 40 | (1) | 2
Other expense | 3,036 | 4,457 | 2,984
Income (loss) before taxes | 926 | (471) | 2,191
Income taxes (benefit) | 666 | (164) | 768
Net income | 260 | (307) | 1,423
Assets | 32,077 | 32,268 | 35,793
Loans | 33,385 | 32,661 | 35,469
Total deposits | 3,449 | 3,809 | 4,627
SEPH |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 2,089 | 4,774 | (74)
Provision for (recovery of) loan losses | (3,258) | (9,599) | (4,090)
Other income (loss) | 404 | 2,974 | 1,848
Other expense | 5,252 | 7,273 | 6,182
Income (loss) before taxes | 499 | 10,074 | (318)
Income taxes (benefit) | 1,375 | 3,526 | (111)
Net income | (876) | 6,548 | (207)
Assets | 24,902 | 25,342 | 33,541
Loans | 10,891 | 12,354 | 15,153
Total deposits | 0 | 0 | 0
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 588 | (138) | 239
Provision for (recovery of) loan losses | 0 | 0 | 0
Other income (loss) | 3,065 | 955 | 513
Other expense | 8,805 | 9,731 | 9,972
Income (loss) before taxes | (5,152) | (8,914) | (9,220)
Income taxes (benefit) | (2,695) | (4,357) | (4,671)
Net income | (2,457) | (4,557) | (4,549)
Assets | 12,790 | 20,438 | 12,256
Loans | (11,048) | (7,986) | (11,609)
Total deposits | (82,799) | (112,052) | (104,278)
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 1,500 | 2,164 | 2,561
Other Noninterest Expense | 0 | 0 | 0
Depreciation, Amortization and Accretion, Net | 0 | 0 | 0
Income taxes (benefit) | 0 | 0 | 0
Assets | (14,679) | (9,204) | (13,557)
Total deposits | (82,799) | (112,052) | (104,278)
Parent Co Gfsc Totals Not Eliminated [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | (912) | (2,302) | (2,322)
Other Noninterest Expense | 8,805 | 9,731 | 9,972
Depreciation, Amortization and Accretion, Net | 0 | 0 | 0
Income taxes (benefit) | (2,695) | (4,357) | (4,671)
Assets | 27,469 | 29,642 | 25,813
Total deposits | $ 0 | $ 0 | $ 0

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